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Pyrosorb Fireseal Class 0 Acoustic Foam Sheets

Fireseal Class 0 Acoustic Foam Sheets


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Fireseal™ is an acoustic foam with a class 0 fire rating; the highest level of fire resistance possible for a flexible acoustic foam. It has passed the following fire safety tests – BS 476 Part 6 & 7 (Class “0”), EN 13501-1 Euro Class B-s1, d0 and UL94 94-V-0.

This foam is non-fibrous and does not shred through contact with high velocity airflow. It received a PASS when tested for Air Erosion Resistance (4001 – 6000 FPM) (ASTM C1071-05 12.7). This means that it can be safely used in airflow systems as it does not dust or migrate.

Fireseal Class 0 Acoustic Foam is also resistant to most fungus and bacteria as it contains anti-fungal agents. When tested for Mildew (Fungus) Resistance (ASTM D-2020-92) it was found to not support growth.

As with all acoustic foam, the acoustic performance of Fireseal improves according to thickness.

The NRC (Noise Reduction Coefficient) of a 12mm thick random incidence is NRC > 0.27. Meanwhile, a 50mm thick random incidence is NRC > 0.67. This means that a 12mm thick piece can absorb up to 27% of sound wave energy, while a 50mm piece can absorb up to 67%.

Fireseal Class 0 Acoustic Foam Sheets are available in thicknesses ranging from ½” to 2”. Each sheet measures approximately 200 cm x 100 cm (78.7” x 39.3”). Please note that sheet sizes may vary slightly as a result of the manufacturing process (+/- 2 cm tolerance).

Common Applications for Fireseal Class 0 Acoustic Foam

There are many effective applications for Fireseal Class 0 Acoustic Foam. As well as general acoustic treatment in buildings, this advanced foam grade can be used to treat the following areas –

  • Automotive – (Cars, Buses, Vans, Tractors, Trains, Trucks, Excavators, etc).
  • Watercrafts / Marine Vessels.
  • Power Generators.
  • Extractor Fans.
  • Compressors.
  • Ductworks.
  • Air Handlers.
  • Home Appliances.

Fireseal is often used for acoustically treating a wide variety of buildings. From cinemas to office buildings, it can be used to improve room acoustics while maintaining the highest standard of fire safety.

Because it has a class 0 fire rating, this foam can also be used on oil rigs, inside generator rooms to form a fire seal and as a custodial mattress to help prevent vandalism in prisons.

Product Features

Type  Impregnated PU Foam
Colour Dark Grey
Density >90kg/m3
Thickness 6mm – 100mm
Operating Temperature -30ºC to 100ºC
Fire Performance EN 13501-1 Euro Class* B-s1,d0
BS 476 Part 6 Fire Propagation Index <12 >6mm
BS 476 Part 7 Surface Spread of flame Class 1
Building Regulations Paragraph A13 (b) Class 0
ASTM E84-09 Surface Burning Characteristic Flame Spread index 10
Smoke Developed Index 20
ASTM C411-04 Hot Surface Performance @100ºC 96hr Pass
UL94 Classification 94-V-0
ASTM C1071-05 12.7 Air Erosion Resistance 6 – 50mm Pass
ASTM D-2020-92 Mildew (Fungus) Resistance Does not support growth
ASTM G21-96 Fungus Resistance Test Does not support growth
ASTM C1104-06 Water Vapour Sorption <9%
ASTM C518-04 Thermal Conductivity 0.32 Btu-in/ft2-hrºF @6mm

*Certification of Euroclass 6mm – 50mm adhered, 50mm unadhered

Acoustic Performance

Sound Absorption @ 12mm αw 0.30
Sound Absorption @ 25mm αw 0.45
Sound Absorption @ 75mm αw 0.75


Why Choose GB Foam?

We have been professionally converting foam since 1976. With more than 40 years of experience, we can offer you expert support and advice regarding our foam products. If you’re unsure about the suitability of a product, for example, one of our team members will be happy to assist you.

GB Foam is ISO 9001 approved. Everything we manufacture is made within our UK based factory in accordance with strict quality control specifications. All our products are thoroughly checked before being shipped to ensure that they meet our high standards of quality.

We are the UK’s leading online supplier of foam products. With a vast range of foam grades to choose from and many professional foam conversion services available, you’re sure to find the products you need here.

We even offer trade discounts for orders in larger volumes. If you are interested in opening a trade account with GB Foam, contact our team directly. You can call us on 01494 441177 or email

Latest Fireseal Class 0 Acoustic Foam Sheets Reviews

  • Rated 5 out of 5
    Ian Lambert

    great website easy to use and above all great quality foam at a decent price - couldn't ask for more

  • Rated 5 out of 5
    Rhys West

    Well, you weren't exaggerating about the fast delivery. Our order arrived in less than 24 hours. Really pleased with the quality of the foam, now to put it to use :)

  • Rated 5 out of 5
    Caroline Brown

    A superb service received from GB Foam Direct. They were extremely helpful in answering all of my questions and I would be happy to recommend them to anyone.

  • Rated 5 out of 5
    Roger Lumley

    I'm very happy with the Fireseal, exactly what I was after and arrived on time! Great work.

  • Rated 5 out of 5
    Guy Burroughs

    Good quality product. Using for lining air ducts. Fast delivery and fair price. Would buy again.

  • Rated 5 out of 5
    Jim Keyes

    This stuff is amazing. It isn't as cheap as the acoustic tiles but I am using it in the engine room so needed it to be Class O.

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We have many customers who started with us in 1976 and are still working with us today, which we like to think reflects on our vision to be the most dynamic foam converter in our industry. For us no job is too big or too small. We offer the same level of service and delivery whether you are a retail customer ordering one piece of foam from home, or a large manufacturer ordering daily.

GB Foam Celebrating 40 Years in Business
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